The investigator attempted to find out the significant relationship between Academic Achievement and Scientific Aptitude in Science among the Students of Standard X. Scientific Aptitude Inventory was developed and Academic Achievement in Science Test as a tool was used to assess the Variables for this study. The Investigators employed Stratified Random Sampling Technique for the selection of the sample. The size of the sample consists of 6 government schools, 4 aided schools in Perambalur District which 30 students from each school are selected. The total size of the sample for this present study was 300 students. The major findings of the study revealed that the aided school students are having higher Scientific Aptitude compared to the government school students. The urban school students are having higher Scientific Aptitude compared to the rural schools students. The female students are having higher Scientific Aptitude compared to the male students. The urban school students are having higher Academic Achievement in science compared to the rural school students.